Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptors
DTC B2705 02: Gearshift Unlock Circuit Short to GroundDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Shift Lock Control Solenoid Ground | -- | 1 | -- | -- |
Shift Lock Control Solenoid Voltage | B2705 02 or 1 | 1 | 2 | -- |
1. Shift lever will not move from PARK with the brake pedal pressed. 2. Shift lever will move from PARK without pressing on the brake pedal. | ||||
Circuit/System Description
The body control module (BCM) controls the automatic transmission shift lock control solenoid by providing a battery positive voltage to the solenoid. The BCM controls the voltage supply circuit to the automatic transmission shift lock control solenoid.
Conditions for Running the DTC
| • | The ignition switch is in the ON position. |
| • | The brake pedal is pressed. |
| • | The transmission is in the PARK position. |
Conditions for Setting the DTC
The DTC sets if there is a short to ground in the automatic transmission shift lock control solenoid control circuit.
Action Taken When the DTC Sets
The BCM will not attempt to enable the voltage supply circuit of the automatic transmission shift lock control solenoid until the next key cycle.
Conditions for Clearing the DTC
| • | A current DTC B2705 will clear when the malfunction is no longer present and the ignition switch is cycled. |
| • | All BCM history codes will clear after 100 ignition cycles with no current codes active during the 100 ignition cycles. |
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Automatic Transmission Shift Lock Control Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- Ignition ON, clear the DTC. Observe the scan tool BCM Brake Applied Output Signal parameter. The parameter should change from ON to OFF when the brake pedal is depressed.
- Ignition ON, while pressing the brake pedal, observe the scan tool Brake Applied Output Signal parameter. The reading should be ON with the brake pedal pressed.
| ⇒ | If the parameter does not change, refer to Stop Lamps Malfunction . |
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the shift lock control solenoid.
- Ignition OFF, test for less than 1 ohm between the ground circuit terminal A and ground.
- Install a test lamp between the ground circuit terminal A and the control circuit terminal B.
- Ignition ON, command the scan tool BCM Brake To Shift Control output control ON and OFF. The test lamp should turn ON and OFF as commanded.
- If all circuits test normal, replace the shift lock control solenoid.
| ⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
| ⇒ | If the test lamp is always ON, test the control circuit for short to voltage. If the circuit tests normal, replace the BCM. |
| ⇒ | If the test lamp is always OFF, test the control circuit for short to ground or an open/high resistance. If the circuit tests normal, replace the BCM. |
Component Testing
- Install a 10 A fused jumper wire between the control circuit terminal A and 12 volts. Install a jumper wire between the ground circuit terminal B and ground.
- Verify the solenoid turns ON and OFF.
| ⇒ | If the function does not perform as specified, replace the shift lock actuator. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for BCM replacement, setup, and programming |
